f.lux is not working on iOS 9.1

I have installed f.lux on my iPhone (ios9.1)
I just can change the wake up time and Enable/Disable. Darkroom doest work like Preview doest too.
If I change At night or Daytime nothing happend.
Please help me.

I tried to install it on my iPad and iPhone with iOS 9.1, the app start with the splash screen icon on white bg then its just black...
Cannot find the app listed in privacy to enable location
something with notifications app is not listed, how to enable both ?

@lorna this was failing on both but looks like that you simply need to select the correct target, did not realized it
so in my case need to set the deployment target to 9.1 as I m using iOS 9.1
this was set by default to 8 in the default project, and either it was not mentionned in the install recipe or I skipped it lol
IPHONEOS_DEPLOYMENT_TARGET = 9.1